Quadrajet help

D

dwarren

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exMember
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Jul 8, 2004
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14233
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Okay....on top of everything else....I think the rebuilt carb I have on port side is shot. I've been having issues with both load and idle and now am convinced this particular issue is a crappy rebuild. The carb looks odd with a different port on the front of it....

I'm just looking to get a new one and be done. Worth 300 bucks to give peace of mind.

1984 454ci 350's. Anyone know the general nomenclature I need to order a new one and.....maybe a reputable place to order it?
 
You'll probably either have to go with a marine Holley'I think the spread bore is a 4175, or a marine edelbrock which is a square bore so you'll need an adapter plate to put on top of your spread bore intake.
May as well go with electric choke too while you're at it.
Those are the only choices I know of for new.
The other option is a good rebuilder for your Qjet. Allstate Carburetor in Central Islip is excellent.
 
Hmm, anyone running a quad on one motor and a holley on the other?
 
Here is by very long story condensed to a few sentences. Needed a rebuild Crusader 220 305 Chev with a Quadrajet Rochester in a twin motor setup. Got both carburetors rebuilt for both engines. One was fine the other after the rebuild wasn’t fine. And after much work and conversation with rebuilder, one of the rebuilt Rochester’s couldn’t be saved, too worn out after the rebuild to be saved and ordered a new carburetor. Also found out the new rebuild motor had issues and was swapping carburetors to trouble shoot the issues with the motor. With that said the final solution was the new carburetor wound up on the older engine and the new rebuild was on the new engine. To this day the new carburetor engine performs better that the old rebuilt carburetor new engine. So the moral of my story sometimes rebuild don’t work out and the cost of new is a better solution considering the time, cost and energy. I know there is a lot of questions in this story and your end results may be different, but new may be cheaper.
 
There is SOOOO much more to the Qjet than most people even realize. Just on the primary side, there's a jet with different tapered needles that fit into the jet and F/A mixture is determined by the thickness of the tapered needle at any given throttle opening. The secondary has a fixed jet with tapered needles. There's a pamphlet showing hundreds(?) of different needles.

I went from the Qjet to the holley 4175, Qjet replecement. Best move I made. The 4175 has a true vacuum secondary. Probably doesn't mean much unless you understand the functions.
 
Whatever you do, don't by an online rebuilt. Especially not from a big Florida based company that has a rising price scale based on length of warranty. Their stuff is junk. When you have a problem, they will replace their carb after you ship it back and wait for the replacement to come back to you. That one will likely be junk too.
If you decide to get a rebuilt, or have yours rebuilt, make sure you use someone local with a good reputation.
Honestly, if your motors are good, I would probably bite the bullet and buy two new Holleys with electric chokes and be done with it.
 
Just spoke to Allstate. Sounds like either the carb I have is "non marine" or it's at least a bad rebuild. Very helpful. I'm going to pull the carb and bring it down to have them look at it. Worst case is I buy a brand new Edelbrock with the adapter plate for the port side now and do the same for starboard next year. Can't spend another grand this year....going broke quick :-).
 
quote:
Originally posted by dwarren

Just spoke to Allstate. Sounds like either the carb I have is "non marine" or it's at least a bad rebuild. Very helpful. I'm going to pull the carb and bring it down to have them look at it. Worst case is I buy a brand new Edelbrock with the adapter plate for the port side now and do the same for starboard next year. Can't spend another grand this year....going broke quick :-).

Click to expand...


Lots of rebuilders adapt automotive carbs for marine use and the boat owner winds up with them unknowingly. Allstate does an excellent job rebuilding and he'll tell you as soon as he looks at yours whether or not it's a marine carb.
If yours is rebuildable, you should be ok with it. While having a real marine carb is ideal, there are probably more boats running around with automotive carbs adapted for marine use out there than there are with marine carbs.
If you do go for a new carb, the Edelbrocks are good units and you can get with with an electric choke if you don't already have it.
 
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